The present invention relates to benzamide compounds of formual (I), the N-oxides and the salts thereof and to compositions comprising the same. The invention also relates to the use of the benzamide compounds, the N-oxides or the salts thereof and to the use of the compositions comprising such compounds for controlling unwanted vegetation.In formula I,Qis selected from the group consisting of radicals of the formulae Q1, Q2, Q3 and Q4；where # in formulae Q1, Q2, Q3 and Q4 indicates the point of attachment to the nitrogen atom；Z2is a covalent bond or a bivalent radical selected from C1-C4-alkanediyl and C1-C4-alkanediyl-O-C1-C4-alkanediyl, where in the last two mentioned radicals the C1-C4-alkanediyl groups are linear and where C1-C4-alkanediyl is unsubstituted, or partly or completely fluorinated or substituted by 1, 2, 3 or 4 groups Rz；and R1, R2a, R2b, R2c, R3, R4, R5, R6a, R6b, R6c, R6d, R7 and Rz are as defined in the claims.
